Grinding machine



G. F. YAGER GRINDING MACHINE July 10, 1934.

Filed March 10, 1930 4 Sheets-Sheet l INVENTOR deoye la ger ATTORN EYS G. F; YAGER GRINDING MACHINE July 10, 1934.

Filed March 10, 1950 4 Sheets-Sheet 2 ATTO RN EYpY July 10, 1934.

G. F YAGER GRINDING momma Filed March 0. 1930 4 Sheets-Sheet 3 INVENTOR w w w ATTORNEYS Filed March 1930 4 Sheets-Sheet 4 INVENTOR BY @607 affyer LJgw ATTORNEYS Patented July 10, 1934 PATENT GFEEQE GRINDING MACHINE George F. Yager, Toledo, Ohio, assignor to The Bunting Brass and Bronze Company, Toledo, Ohio, a corporation of Ohio Application March 10,

6 Claims.

This invention relates generally to grinding machines designed for removing scale and squaring the ends of bushings, and consists of certain o ,novel features of construction, combinations and arrangements of parts that will be hereinafter more fully described and particularly pointed out in the appended claims.

In the accompanying drawings:

Figure 1 is an end elevation of a machine em- 10 bodying my invention;

Figure 2 is a longitudinal vertical sectional view through the machine;

Figure 3 is a fragmentary elevation of the machine and showing a portion of the casing in section;

Figure 4 is a view taken at right angles to Figure 3;

Figure 5 is a fragmentary front elevation of .1 a slightly modified construction;

20 Figure 6 is a fragmentary end elevation of the a wall of the frame and showing a top plan of the cam 37 and associated parts;

Figure 8 is a top plan of the construction shown in Figure 9;

Figure 9 is a fragmentary elevation of the lever '72 and associated parts.

Referring now to the drawings l is a base or frame having integral top, bottom and side walls 2, 3, 4 and 5 respectively. 6 and '7 respectively are heads mounted in spaced relation upon the top wall 2 of the frame, preferably upon opposite sides of a depression 8 therein; 9 and 10 respectively are rotating shafts journaled in the respective heads 6 and '7, and having substantially flat disk-shaped heads 9' and 10' respectively at their inner ends; 11 and 12 respectively are pulleys keyed to the shafts 9 and 10 respectively substantially midway of their ends and adapted to be driven by suitable belts (not shown) 11 and 12 are dust caps for the pulleys 11 and 12; 13 and 14 respectively are abrasive wheel holding discs 1 detachably mounted to the opposed inner faces of 45 the shaft heads 9' and 10'; and 13' and 14' are abrasive wheels cemented upon the opposed inner faces of the discs 13 and 14. 15 and 16 are tubular dust guards secured to the outer faces of the shaft heads 9' and 10 respectively and projecting laterally therefrom over the adjacent end portions of the heads 6 and '7; 1'7 and 18 are dust guards bolted to the opposed inner ends of the heads 6 and '7 and having annular inwardly extending flanges 1'7 and 18 overlapping and 1930, Serial No.- 434,799

serving as guards for the discs 13 and 14; and 19 is a band overlapping the inwardly extending flanges 17 and 18 and cooperating therewith and with the guards 1'7 and 18 to form a housing for the shaft heads 9, 10 and discs 13 and 14, and abrasive wheels 13' and 14. Preferably this band 19 is provided adjacent the depression 8 in the top 2 of the frame with a circular opening 20 through which dust and the like may be discharged from the housing.

In the present instance a thrust bearing 21 is provided about the shaft 10 between the outer face of the pulley 12 and a. shoulder 22 of the head 7, hence the shaft 10 is free to rotate Within the head '7 but is effectively prevented from moving longitudinally thereof. However, the shaft 10, head 7 and disc 14, and abrasive wheel 14 may be adjusted longitudinally in unisonv whenever desired toward and away from the disc 13 and abrasive wheel 13, shaft 9 and head 6 to compensate for bushings of different lengths. As shown, this is accomplished by the provision of the rotating screw or bolt 23 having a cylindrical shank 24 thereof journaled in a block 25 keyed upon the top wall 2 of the frame, and having a threaded portion 26 engaging the threaded bushing 2'7 keyed within a suitable opening in a depending portion 28 of the head '7.

Pivotally mounted upon a laterally projecting portion 29 'of the head 6 is a vertically arranged lever 30 that is actuable by a rotating cam 31 to shift the rotating shaft 9 longitudinally within the head 6 to move the abrasive wheel 13' toward and away from the cooperating abrasive wheel 14. Preferably the connection between the shaft 9 and lever 30 is in the form of a thrust bearing 32 surrounding the shaft 9 within the lever 30 at the upper end thereof, while the connection between the cam 31 and lever 30 comprises the roller 33, stem 34, block and reciprocating link 36 respectively. As shown, the roller 33 travels in a cam slot 3'? in the cam 31 and is mounted upon the stem 34 and in turn is received within the block 35 upon the outer surface of the cam 31. The link 36 is provided'at its opposite ends with balls 38 and 38 respectively that are universally mounted within the block 35 and lever 30. Thus rotation of the cam 31 will cause the roller 33 to travel in the cam slot 37 which is so fashioned that it will cause the link 36 to reciprocate and rock the lever 30 about its pivot so that the shaft 9 and abrasive wheel 13 will be moved longitudinally toward and away from the cooperating abrasive wheel 14.

Supporting the cam 31 is a shaft 39 journaled of the arm 63.

at its opposite ends in brackets 42 and 43 respectively seemed to the upright walls 4 and 5 of the frame. 44 is a main drive shaft iournaled at its opposite ends in the Walls 4 and 5 of the frame and provided at one end, preferably outside the wall 4 with a main drive pulley 44. 45 is a stub shaft journaled in the wall 5; 46 and 47 are gears keyed upon the drive and stub shafts 45 and 44 respectively; 48 is a pinion on the stub shaft 45; 49 is a clutch collar of suitable design controlling the driving connection between the stub shaft 45 and pinion, and 50 is a gear keyed on the shaft 39 and adapted to be rotated by the pinion 48. 51 is a shifter fork for actuating the collar 49 to establish a driving connection between the stub shaft 45 and pinion 48; 52 is a shaft for the fork 51; and 53 is an operating lever for the shaft. 54 is a stub shaft journaled in the wall 5 and having a polygonal end portion 55 engageable by a suitable hand crank (not shown); and 56 is a pinion keyed upon the stub shaft 54 and meshing with the gear 50 whereby the shaft 39 may be rotated by hand when the clutch 49 is inactive.

In the present instance the bushings to be ground are fed onto and travel longitudinally of a downwardly and inwardly inclined chute 59 into engagement with a substantially L-shaped stop 60 from which they are removed laterally by means of a reciprocating plunger or slide 61 into the eye 62 of a pivotally mounted work holder or arm 63 that is adapted to swing between the abrasive wheels 13 and 14' carried by the rotating shafts 9 and 16. As shown, the chute 59 is bolted upon a bracket 64 and the latter is adjustable vertically upon a vertical portion 65 of a bracket 66 secured to the wall 4' of the frame. Preferably the slide 61 has a reduced shank portion 61 that reciprocates in a suitable guideway 66' in a bracket 67 mounted upon the wall 4 of the frame.

The slide 61 is adapted to push a bushing from the stop 60 into the eye 62 of the work holder or arm 63 when the eye is opposite the stop; and the work holder or arm 63 is adapted to carry the bushing received from the stop inwardly between the abrasive wheels 13 and 14 so that opposite ends of the bushing will be ground by the abrasive wheels 13' and 14'. For this purpose, both the slide 61 and the work holder or arm 63 are operatively connected to the cam shaft 39. As shown, a lever 68 is connected to the shank of the slide 61 and is rigid with a stub shaft 69 journaled in a bracket 69 on the wall 4 of the frame. A spring actuated lever 70 is rigid with the stub shaft 69 and is connected intermediate its ends by a link '71 to a lever 72 secured upon a stub shaft '73 journaled within a bearing 74 upon the wall 4 of the frame. In the present instance, the bolt 75 connects the link '71 to the lever '72 and the latter carries a stub shaft 75 upon which a roller '76 is mounted for engagement with the cam surface '77 of a cam 78 keyed upon the cam shaft 39. The work holder or arm 63 is clamped at its lower end to a shaft 80 journaled in laterally spaced brackets 81 and 82 on the wall 4. A lever 83 is rigid with the shaft 80 and carries a roller 84 that engages a cam surface 85 at the periphery of a cam 86 keyed upon the shaft 39.

In use, rough bushings of approximately 3 in diameter move by gravity down the chute 59 into engagement with a stop 60 and are moved one at a time by the slide 61 into the eye 62 This arm 63 then swings inwardly and carries the bushing between the rotating abrasive wheels 13' and 14. While between the wheels, the shaft 9 is moved longitudinally toward the shaft 10 and causes the opposite ends of the bushing to be engaged by the abrasive wheels 13' and 14. While in engagement with the abrasive wreels, the arm 63 is moved inwardly and then outwardly so that opposite ends of the bush ng will be moved across and ground by the opposed inner faces of the abrasive wheels. In this connection it will be noted that the bushings are loose within the eye 62 of the arm 63 so that when the latter is between the abrasive wheels 13 and 14 the bushings are capable of floating, so that opposite ends thereof may be ground square no matter how crooked the bushings may be. When about even with the front edges of the abrasive wheels, the arm 63 is moved outwardly from between the abrasive wheels so that the eye 62 will again be in alignment with the slide 61 whereupon another rough bushing will be pushed by the slide 61 into the eye 62 and will cause the bushing just ground to be removed from the eye 62 into a suitable chute or receptacle (not shown). 100

Thus the abrasive wheels 13 and 14 are capable of quickly removing scale from and squaring the ends of rough bushings.

In Figures 5 and 6 I have shown a slight modification in which a double chute 90 is provided for feeding two bushings at a time into vertically spaced eyes 91 and 92 in the head 93 of the feed arm 94. With this construction bushings of approximately 1 in diameter may be fed onto the upper and lower chutes 95 and 96 of the double chute 90 so that the bushings will move by gravity down the chutes into engagement with the stop 97. Otherwise the construction and operation of the machine is identical with that previously described in connection with Figures 1 to 4 inclusive.

While it is believed that from the foregoing the nature and advantages of my invention will be readily apparent, I desire to have it understood that I do not limit myself to what is herein shown and described, and that such changes may be resorted to when desired as fall within the scope of what is claimed.

What I claim as my invention is:

1. In a grinding machine, a frame, brackets carried by the frame, a work chute supported by one of said brackets, a grinding element, and means for transferring work from the chute to the element including a plunger having a shank portion reciprocating in another of said brackets 130 and engageable with work in the chute, a stub shaft journaled in another of said brackets, a lever connected to the shank portion of the plunger and rigid with the stub shaft, a spring actuated lever rigid with the stub shaft, a rotary 35 earn, a second stub shaft carried by the frame adjacent the cam, a lever on the second stub shaft, a link terminally connected to the second and third mentioned levers and adjustable longitudinally thereof, a third stub shaft carried by 140 the second mentioned lever, and an operating connection between said cam and second lever including means carried by said third stub shaft engaging the rotary earn.

2. In a grinding machine, a frame, brackets 145 carried by the frame, a work chute supported by one of said brackets, a grinding element, and means for transferring work from the chute to the element including a plunger having a shank portion reciprocating in another of said brackets 150 and engageable with work in the chute, a stub shaft journaled in another of said brackets, a lever connected to the shank portion of the plunger and rigid with the stub shaft, a lever rigid with the stub shaft, a rotary cam, a second stub shaft carried by the frame adjacent the cam, a lever on the second stub shaft, a link terminally connected to the second and third mentioned levers, a third stub shaft carried by the second mentioned lever, and an operating connection between said cam and second lever including means carried by said third stub shaft engaging the rotary cam.

3. In a grinding machine, the combination with a frame, a pair of substantially aligned heads in the frame, shafts journaled in said heads, and grinding elements carried by the opposed inner ends of said shafts, of dust guards secured to the opposed inner ends of the heads in parallel relation to said grinding elements and having annular inwardly extending flanges overlapping and serving as guards for the grinding elements, and a removable band overlapping said flanges and cooperating therewith and with the guards to form a housing for the grinding elements, said band being provided with an opening through which dust and the like may be discharged from the housing.

4. In a grinding machine, the combination with a frame, a pair of substantially aligned heads on the frame, shafts journaled in said heads, and provided at their opposed inner ends with heads, and disk-like grinding elements carried by said shaft heads, of disk-like tubular dust guards secured to and projecting laterally outwardly from said shaft heads over the adjacent end portions of the aligned heads, and disk-like dust guards secured to the adjacent end portions of the aligned heads about the tubular dust guards in parallel relation to the grinding elements and having annular inwardly extending flanges overlapping and serving as guards for the grinding elements.

5. In a grinding machine, a work chute, a grinding element, and means for transferring work from the chute to the element including a plunger having a shank portion engageable with work in the chute, a stub shaft, a lever connected to the shank portion of the plunger and rigid with the stub shaft, a spring actuated lever rigid with the stub shaft, a rotary cam, a second stub shaft adjacent the cam, a lever on the second stub shaft, a link terminally connected to the second and third mentioned levers and adjustable longitudinally thereof, a third stub shaft carried by the second mentioned lever, and an operating connection between said cam and second lever including means carried by said third stub shaft engaging the rotary cam.

6. In a grinding machine, a work chute, a grinding element, and means for transferring work from the chute to the element including a plunger having a shank portion engageable with work in the chute, a stub shaft, a lever connected to the shank portion of the plunger and rigid with the stub shaft, a lever rigid with the stub shaft, a rotary cam, a second stub shaft adjacent the cam, a lever on the second stub shaft, a link terminally connected to the second and third mentioned levers, a third stub shaft carried by the second mentioned lever, and an operating connection between said cam and second mentioned lever including means carried by said third stub shaft engaging the rotary cam.

GEORGE F. YAGER. 

